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R Software Module

rwasp_autocorrelation.wasp

Title produced by software

(Partial) Autocorrelation Function

Date of computation

Tue, 09 Dec 2008 13:11:02 -0700

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Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?v=date/2008/Dec/09/t12288535669fpm4m6ullq6fk0.htm/, Retrieved Fri, 24 May 2024 23:04:55 +0000

Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=31768, Retrieved Fri, 24 May 2024 23:04:55 +0000

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Estimated Impact

146

Family? (F = Feedback message, R = changed R code, M = changed R Module, P = changed Parameters, D = changed Data)

F       [(Partial) Autocorrelation Function] [tinneke_debock.wo...] [2008-12-09 20:11:02] [20137734a2343a7bbbd59daaec7ad301] [Current]

Feedback Forum

2008-12-13 10:01:40 [Sofie Sergoynne] [reply] 
Correcte redenering. dalende trend en seizoenaliteit zijn idd eruit gehaald, dit is dus een goede transformatie om de tijdreeks stationair te maken.
2008-12-13 10:11:28 [Sofie Sergoynne] [reply] 
Het antwoord van de student is niet helemaal correct. 
Aanvullingen: Om een niet-seizoenaal AR process te ontdekken moeten we kijken naar de eerste 4-5 coëfficiënten van de ACF. Lag 0 wordt niet mee in rekening genomen. De staafjes zijn positief en dalen naar 0. Dit wijst op een AR-proces. . Om de orde van dit AR-proces te kennen kijken we naar de PACF. De eerste 2 coëfficiënten significant en de derde net niet. We kunnen dus een AR(3)-proces veronderstellen.p=3 Om een seizoenaal proces te ontdekken moet je kijken naar lag 12, lag 24, lag 36, lag48,… in ACF. Hier is echter geen seizoenaliteit op te merken waardoor er dus geen sprake is van een SAR-proces en P=0. 
 
Om een niet-seizoenaal MA-proces te ontdekken ontdekken moeten we kijken naar de eerste 4-5 coëfficiënten van de PACF. Hier is geen patroon in op te merken waardoor er geen sprake is van een MA-proces en q=0. Om een seizoenaal proces te ontdekken moet je kijken naar lag12, lag24, … deze vertonen negatieve coëfficiënten die naar nul gaan. Dit wijst op een SMA-proces. Om van dit proces de orde te bepalen moet je kijken naar de seizoenale coëfficiënten in ACF.  Deze coëfficiënten zijn significant verschillend van nul waardoor Q=1. 
 
 
2008-12-16 16:37:29 [Dave Bellekens] [reply] 
Je hebt de juiste parameters gevonden om de reeks stationair te maken. Als we eenmaal niet-seizoenaal en éénmaal seizoenaal differentiëren bekomen we een autocorrelatie functie zonder trend en zonder pieken. 
 
2008-12-16 16:44:47 [Dave Bellekens] [reply] 
Je conclusies over de ARMA processen zijn wat beknopt en niet helemaal correct. 
Om een AR-proces te zoeken, kijk je inderdaad eerst naar de eerste coëfficiënen van de autocorrelatie. Indien je hier een patroon vindt dat wijst op AR-proces, lijk je hoeveel coëfficiënten er significant zijn in de partiële autocorrelatie. Hier zijn dit er 2 (zelfs 3 als je deze 3e meetelt) wat dus wijst op AR2-3 proces.

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Summary of computational transaction
Raw Input	view raw input (R code)
Raw Output	view raw output of R engine
Computing time	1 seconds
R Server	'George Udny Yule' @ 72.249.76.132

\begin{tabular}{lllllllll}
\hline
Summary of computational transaction \tabularnewline
Raw Input & view raw input (R code)  \tabularnewline
Raw Output & view raw output of R engine  \tabularnewline
Computing time & 1 seconds \tabularnewline
R Server & 'George Udny Yule' @ 72.249.76.132 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=31768&T=0

[TABLE]
[ROW][C]Summary of computational transaction[/C][/ROW]
[ROW][C]Raw Input[/C][C]view raw input (R code) [/C][/ROW]
[ROW][C]Raw Output[/C][C]view raw output of R engine [/C][/ROW]
[ROW][C]Computing time[/C][C]1 seconds[/C][/ROW]
[ROW][C]R Server[/C][C]'George Udny Yule' @ 72.249.76.132[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=31768&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=31768&T=0

As an alternative you can also use a QR Code:

The GUIDs for individual cells are displayed in the table below:

Summary of computational transaction
Raw Input	view raw input (R code)
Raw Output	view raw output of R engine
Computing time	1 seconds
R Server	'George Udny Yule' @ 72.249.76.132

Autocorrelation Function
Time lag k	ACF(k)	T-STAT	P-value
1	0.187552	3.5536	0.000215
2	0.317794	6.0213	0
3	0.179563	3.4022	0.000372
4	0.155303	2.9426	0.001733
5	0.127596	2.4176	0.008061
6	0.06371	1.2071	0.114087
7	-0.054701	-1.0364	0.150347
8	-0.011735	-0.2224	0.412083
9	-0.080833	-1.5316	0.063255
10	-0.174708	-3.3102	0.000513
11	-0.055263	-1.0471	0.147883
12	-0.480698	-9.1079	0
13	-0.168514	-3.1929	0.000767
14	-0.172913	-3.2762	0.000577
15	-0.128287	-2.4307	0.007779
16	-0.163167	-3.0916	0.001073
17	-0.121097	-2.2945	0.01117
18	-0.103099	-1.9534	0.025772
19	0.020128	0.3814	0.351578
20	-0.002775	-0.0526	0.479049
21	-0.006426	-0.1217	0.451583
22	-0.006358	-0.1205	0.45209
23	-0.004364	-0.0827	0.467075
24	-0.006343	-0.1202	0.452205
25	0.094911	1.7983	0.036484

\begin{tabular}{lllllllll}
\hline
Autocorrelation Function \tabularnewline
Time lag k & ACF(k) & T-STAT & P-value \tabularnewline
1 & 0.187552 & 3.5536 & 0.000215 \tabularnewline
2 & 0.317794 & 6.0213 & 0 \tabularnewline
3 & 0.179563 & 3.4022 & 0.000372 \tabularnewline
4 & 0.155303 & 2.9426 & 0.001733 \tabularnewline
5 & 0.127596 & 2.4176 & 0.008061 \tabularnewline
6 & 0.06371 & 1.2071 & 0.114087 \tabularnewline
7 & -0.054701 & -1.0364 & 0.150347 \tabularnewline
8 & -0.011735 & -0.2224 & 0.412083 \tabularnewline
9 & -0.080833 & -1.5316 & 0.063255 \tabularnewline
10 & -0.174708 & -3.3102 & 0.000513 \tabularnewline
11 & -0.055263 & -1.0471 & 0.147883 \tabularnewline
12 & -0.480698 & -9.1079 & 0 \tabularnewline
13 & -0.168514 & -3.1929 & 0.000767 \tabularnewline
14 & -0.172913 & -3.2762 & 0.000577 \tabularnewline
15 & -0.128287 & -2.4307 & 0.007779 \tabularnewline
16 & -0.163167 & -3.0916 & 0.001073 \tabularnewline
17 & -0.121097 & -2.2945 & 0.01117 \tabularnewline
18 & -0.103099 & -1.9534 & 0.025772 \tabularnewline
19 & 0.020128 & 0.3814 & 0.351578 \tabularnewline
20 & -0.002775 & -0.0526 & 0.479049 \tabularnewline
21 & -0.006426 & -0.1217 & 0.451583 \tabularnewline
22 & -0.006358 & -0.1205 & 0.45209 \tabularnewline
23 & -0.004364 & -0.0827 & 0.467075 \tabularnewline
24 & -0.006343 & -0.1202 & 0.452205 \tabularnewline
25 & 0.094911 & 1.7983 & 0.036484 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=31768&T=1

[TABLE]
[ROW][C]Autocorrelation Function[/C][/ROW]
[ROW][C]Time lag k[/C][C]ACF(k)[/C][C]T-STAT[/C][C]P-value[/C][/ROW]
[ROW][C]1[/C][C]0.187552[/C][C]3.5536[/C][C]0.000215[/C][/ROW]
[ROW][C]2[/C][C]0.317794[/C][C]6.0213[/C][C]0[/C][/ROW]
[ROW][C]3[/C][C]0.179563[/C][C]3.4022[/C][C]0.000372[/C][/ROW]
[ROW][C]4[/C][C]0.155303[/C][C]2.9426[/C][C]0.001733[/C][/ROW]
[ROW][C]5[/C][C]0.127596[/C][C]2.4176[/C][C]0.008061[/C][/ROW]
[ROW][C]6[/C][C]0.06371[/C][C]1.2071[/C][C]0.114087[/C][/ROW]
[ROW][C]7[/C][C]-0.054701[/C][C]-1.0364[/C][C]0.150347[/C][/ROW]
[ROW][C]8[/C][C]-0.011735[/C][C]-0.2224[/C][C]0.412083[/C][/ROW]
[ROW][C]9[/C][C]-0.080833[/C][C]-1.5316[/C][C]0.063255[/C][/ROW]
[ROW][C]10[/C][C]-0.174708[/C][C]-3.3102[/C][C]0.000513[/C][/ROW]
[ROW][C]11[/C][C]-0.055263[/C][C]-1.0471[/C][C]0.147883[/C][/ROW]
[ROW][C]12[/C][C]-0.480698[/C][C]-9.1079[/C][C]0[/C][/ROW]
[ROW][C]13[/C][C]-0.168514[/C][C]-3.1929[/C][C]0.000767[/C][/ROW]
[ROW][C]14[/C][C]-0.172913[/C][C]-3.2762[/C][C]0.000577[/C][/ROW]
[ROW][C]15[/C][C]-0.128287[/C][C]-2.4307[/C][C]0.007779[/C][/ROW]
[ROW][C]16[/C][C]-0.163167[/C][C]-3.0916[/C][C]0.001073[/C][/ROW]
[ROW][C]17[/C][C]-0.121097[/C][C]-2.2945[/C][C]0.01117[/C][/ROW]
[ROW][C]18[/C][C]-0.103099[/C][C]-1.9534[/C][C]0.025772[/C][/ROW]
[ROW][C]19[/C][C]0.020128[/C][C]0.3814[/C][C]0.351578[/C][/ROW]
[ROW][C]20[/C][C]-0.002775[/C][C]-0.0526[/C][C]0.479049[/C][/ROW]
[ROW][C]21[/C][C]-0.006426[/C][C]-0.1217[/C][C]0.451583[/C][/ROW]
[ROW][C]22[/C][C]-0.006358[/C][C]-0.1205[/C][C]0.45209[/C][/ROW]
[ROW][C]23[/C][C]-0.004364[/C][C]-0.0827[/C][C]0.467075[/C][/ROW]
[ROW][C]24[/C][C]-0.006343[/C][C]-0.1202[/C][C]0.452205[/C][/ROW]
[ROW][C]25[/C][C]0.094911[/C][C]1.7983[/C][C]0.036484[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=31768&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=31768&T=1

As an alternative you can also use a QR Code:

The GUIDs for individual cells are displayed in the table below:

Autocorrelation Function
Time lag k	ACF(k)	T-STAT	P-value
1	0.187552	3.5536	0.000215
2	0.317794	6.0213	0
3	0.179563	3.4022	0.000372
4	0.155303	2.9426	0.001733
5	0.127596	2.4176	0.008061
6	0.06371	1.2071	0.114087
7	-0.054701	-1.0364	0.150347
8	-0.011735	-0.2224	0.412083
9	-0.080833	-1.5316	0.063255
10	-0.174708	-3.3102	0.000513
11	-0.055263	-1.0471	0.147883
12	-0.480698	-9.1079	0
13	-0.168514	-3.1929	0.000767
14	-0.172913	-3.2762	0.000577
15	-0.128287	-2.4307	0.007779
16	-0.163167	-3.0916	0.001073
17	-0.121097	-2.2945	0.01117
18	-0.103099	-1.9534	0.025772
19	0.020128	0.3814	0.351578
20	-0.002775	-0.0526	0.479049
21	-0.006426	-0.1217	0.451583
22	-0.006358	-0.1205	0.45209
23	-0.004364	-0.0827	0.467075
24	-0.006343	-0.1202	0.452205
25	0.094911	1.7983	0.036484

Partial Autocorrelation Function
Time lag k	PACF(k)	T-STAT	P-value
1	0.187552	3.5536	0.000215
2	0.292922	5.5501	0
3	0.093512	1.7718	0.038638
4	0.033995	0.6441	0.259959
5	0.032214	0.6104	0.271005
6	-0.024285	-0.4601	0.322846
7	-0.139405	-2.6414	0.004309
8	-0.030697	-0.5816	0.280592
9	-0.045877	-0.8693	0.192645
10	-0.156693	-2.9689	0.001595
11	0.037591	0.7122	0.238389
12	-0.427945	-8.1084	0
13	-0.036401	-0.6897	0.245414
14	0.123319	2.3366	0.010006
15	0.047112	0.8926	0.186322
16	-0.060609	-1.1484	0.125789
17	-0.017722	-0.3358	0.368615
18	0.007818	0.1481	0.44116
19	0.023368	0.4428	0.329106
20	0.047983	0.9091	0.181941
21	-0.03962	-0.7507	0.226664
22	-0.157258	-2.9796	0.001541
23	0.010195	0.1932	0.42347
24	-0.263321	-4.9892	0
25	0.056986	1.0797	0.140495

\begin{tabular}{lllllllll}
\hline
Partial Autocorrelation Function \tabularnewline
Time lag k & PACF(k) & T-STAT & P-value \tabularnewline
1 & 0.187552 & 3.5536 & 0.000215 \tabularnewline
2 & 0.292922 & 5.5501 & 0 \tabularnewline
3 & 0.093512 & 1.7718 & 0.038638 \tabularnewline
4 & 0.033995 & 0.6441 & 0.259959 \tabularnewline
5 & 0.032214 & 0.6104 & 0.271005 \tabularnewline
6 & -0.024285 & -0.4601 & 0.322846 \tabularnewline
7 & -0.139405 & -2.6414 & 0.004309 \tabularnewline
8 & -0.030697 & -0.5816 & 0.280592 \tabularnewline
9 & -0.045877 & -0.8693 & 0.192645 \tabularnewline
10 & -0.156693 & -2.9689 & 0.001595 \tabularnewline
11 & 0.037591 & 0.7122 & 0.238389 \tabularnewline
12 & -0.427945 & -8.1084 & 0 \tabularnewline
13 & -0.036401 & -0.6897 & 0.245414 \tabularnewline
14 & 0.123319 & 2.3366 & 0.010006 \tabularnewline
15 & 0.047112 & 0.8926 & 0.186322 \tabularnewline
16 & -0.060609 & -1.1484 & 0.125789 \tabularnewline
17 & -0.017722 & -0.3358 & 0.368615 \tabularnewline
18 & 0.007818 & 0.1481 & 0.44116 \tabularnewline
19 & 0.023368 & 0.4428 & 0.329106 \tabularnewline
20 & 0.047983 & 0.9091 & 0.181941 \tabularnewline
21 & -0.03962 & -0.7507 & 0.226664 \tabularnewline
22 & -0.157258 & -2.9796 & 0.001541 \tabularnewline
23 & 0.010195 & 0.1932 & 0.42347 \tabularnewline
24 & -0.263321 & -4.9892 & 0 \tabularnewline
25 & 0.056986 & 1.0797 & 0.140495 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=31768&T=2

[TABLE]
[ROW][C]Partial Autocorrelation Function[/C][/ROW]
[ROW][C]Time lag k[/C][C]PACF(k)[/C][C]T-STAT[/C][C]P-value[/C][/ROW]
[ROW][C]1[/C][C]0.187552[/C][C]3.5536[/C][C]0.000215[/C][/ROW]
[ROW][C]2[/C][C]0.292922[/C][C]5.5501[/C][C]0[/C][/ROW]
[ROW][C]3[/C][C]0.093512[/C][C]1.7718[/C][C]0.038638[/C][/ROW]
[ROW][C]4[/C][C]0.033995[/C][C]0.6441[/C][C]0.259959[/C][/ROW]
[ROW][C]5[/C][C]0.032214[/C][C]0.6104[/C][C]0.271005[/C][/ROW]
[ROW][C]6[/C][C]-0.024285[/C][C]-0.4601[/C][C]0.322846[/C][/ROW]
[ROW][C]7[/C][C]-0.139405[/C][C]-2.6414[/C][C]0.004309[/C][/ROW]
[ROW][C]8[/C][C]-0.030697[/C][C]-0.5816[/C][C]0.280592[/C][/ROW]
[ROW][C]9[/C][C]-0.045877[/C][C]-0.8693[/C][C]0.192645[/C][/ROW]
[ROW][C]10[/C][C]-0.156693[/C][C]-2.9689[/C][C]0.001595[/C][/ROW]
[ROW][C]11[/C][C]0.037591[/C][C]0.7122[/C][C]0.238389[/C][/ROW]
[ROW][C]12[/C][C]-0.427945[/C][C]-8.1084[/C][C]0[/C][/ROW]
[ROW][C]13[/C][C]-0.036401[/C][C]-0.6897[/C][C]0.245414[/C][/ROW]
[ROW][C]14[/C][C]0.123319[/C][C]2.3366[/C][C]0.010006[/C][/ROW]
[ROW][C]15[/C][C]0.047112[/C][C]0.8926[/C][C]0.186322[/C][/ROW]
[ROW][C]16[/C][C]-0.060609[/C][C]-1.1484[/C][C]0.125789[/C][/ROW]
[ROW][C]17[/C][C]-0.017722[/C][C]-0.3358[/C][C]0.368615[/C][/ROW]
[ROW][C]18[/C][C]0.007818[/C][C]0.1481[/C][C]0.44116[/C][/ROW]
[ROW][C]19[/C][C]0.023368[/C][C]0.4428[/C][C]0.329106[/C][/ROW]
[ROW][C]20[/C][C]0.047983[/C][C]0.9091[/C][C]0.181941[/C][/ROW]
[ROW][C]21[/C][C]-0.03962[/C][C]-0.7507[/C][C]0.226664[/C][/ROW]
[ROW][C]22[/C][C]-0.157258[/C][C]-2.9796[/C][C]0.001541[/C][/ROW]
[ROW][C]23[/C][C]0.010195[/C][C]0.1932[/C][C]0.42347[/C][/ROW]
[ROW][C]24[/C][C]-0.263321[/C][C]-4.9892[/C][C]0[/C][/ROW]
[ROW][C]25[/C][C]0.056986[/C][C]1.0797[/C][C]0.140495[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=31768&T=2

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=31768&T=2

As an alternative you can also use a QR Code:

The GUIDs for individual cells are displayed in the table below:

Partial Autocorrelation Function
Time lag k	PACF(k)	T-STAT	P-value
1	0.187552	3.5536	0.000215
2	0.292922	5.5501	0
3	0.093512	1.7718	0.038638
4	0.033995	0.6441	0.259959
5	0.032214	0.6104	0.271005
6	-0.024285	-0.4601	0.322846
7	-0.139405	-2.6414	0.004309
8	-0.030697	-0.5816	0.280592
9	-0.045877	-0.8693	0.192645
10	-0.156693	-2.9689	0.001595
11	0.037591	0.7122	0.238389
12	-0.427945	-8.1084	0
13	-0.036401	-0.6897	0.245414
14	0.123319	2.3366	0.010006
15	0.047112	0.8926	0.186322
16	-0.060609	-1.1484	0.125789
17	-0.017722	-0.3358	0.368615
18	0.007818	0.1481	0.44116
19	0.023368	0.4428	0.329106
20	0.047983	0.9091	0.181941
21	-0.03962	-0.7507	0.226664
22	-0.157258	-2.9796	0.001541
23	0.010195	0.1932	0.42347
24	-0.263321	-4.9892	0
25	0.056986	1.0797	0.140495

Figure 1

PNG link

Postscript link

PDF link

Figure 2

PNG link

Postscript link

PDF link

Parameters (Session):

par1 = Default ; par2 = 0.5 ; par3 = 1 ; par4 = 1 ; par5 = 12 ;

Parameters (R input):

par1 = Default ; par2 = 0.5 ; par3 = 1 ; par4 = 1 ; par5 = 12 ;

R code (references can be found in the software module):

if (par1 == 'Default') {
par1 = 10*log10(length(x))
} else {
par1 <- as.numeric(par1)
}
par2 <- as.numeric(par2)
par3 <- as.numeric(par3)
par4 <- as.numeric(par4)
par5 <- as.numeric(par5)
if (par2 == 0) {
x <- log(x)
} else {
x <- (x ^ par2 - 1) / par2
}
if (par3 > 0) x <- diff(x,lag=1,difference=par3)
if (par4 > 0) x <- diff(x,lag=par5,difference=par4)
bitmap(file='pic1.png')
racf <- acf(x,par1,main='Autocorrelation',xlab='lags',ylab='ACF')
dev.off()
bitmap(file='pic2.png')
rpacf <- pacf(x,par1,main='Partial Autocorrelation',xlab='lags',ylab='PACF')
dev.off()
(myacf <- c(racf$acf))
(mypacf <- c(rpacf$acf))
lengthx <- length(x)
sqrtn <- sqrt(lengthx)
load(file='createtable')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,'Autocorrelation Function',4,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Time lag k',header=TRUE)
a<-table.element(a,hyperlink('basics.htm','ACF(k)','click here for more information about the Autocorrelation Function'),header=TRUE)
a<-table.element(a,'T-STAT',header=TRUE)
a<-table.element(a,'P-value',header=TRUE)
a<-table.row.end(a)
for (i in 2:(par1+1)) {
a<-table.row.start(a)
a<-table.element(a,i-1,header=TRUE)
a<-table.element(a,round(myacf[i],6))
mytstat <- myacf[i]*sqrtn
a<-table.element(a,round(mytstat,4))
a<-table.element(a,round(1-pt(abs(mytstat),lengthx),6))
a<-table.row.end(a)
}
a<-table.end(a)
table.save(a,file='mytable.tab')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,'Partial Autocorrelation Function',4,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Time lag k',header=TRUE)
a<-table.element(a,hyperlink('basics.htm','PACF(k)','click here for more information about the Partial Autocorrelation Function'),header=TRUE)
a<-table.element(a,'T-STAT',header=TRUE)
a<-table.element(a,'P-value',header=TRUE)
a<-table.row.end(a)
for (i in 1:par1) {
a<-table.row.start(a)
a<-table.element(a,i,header=TRUE)
a<-table.element(a,round(mypacf[i],6))
mytstat <- mypacf[i]*sqrtn
a<-table.element(a,round(mytstat,4))
a<-table.element(a,round(1-pt(abs(mytstat),lengthx),6))
a<-table.row.end(a)
}
a<-table.end(a)
table.save(a,file='mytable1.tab')

Free Statistics

Description of Statistical Computation

Tree of Dependent Computations

Dataset

Tables (Output of Computation)

Figures (Output of Computation)

Input Parameters & R Code